A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a?

NEET 2014 Physics question

Physics Laws of Motion NEET 2014

A balloon with mass is descending down with an acceleration (where ). How much mass should be removed from it so that it starts moving up with an acceleration ?

(1)Correct
(2)
(3)
(4)

Answer: (1)

Solution

Let be the (constant) upthrust. While descending with acceleration : ... (i) After removing mass the balloon moves up with acceleration : ... (ii) Adding (i) and (ii): $mg -

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Question ID VK-091480